From: Pavel Emelyanov <xemul@parallels.com>
Date: Fri, 9 Dec 2011 06:21:53 +0000 (+0000)
Subject: inet_diag: Export inet diag cookie checking routine
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=b005ab4ef8805dc4604848c9d2ccca9d71f8fc46;p=openwrt%2Fstaging%2Fblogic.git

inet_diag: Export inet diag cookie checking routine

The netlink diag susbsys stores sk address bits in the nl message
as a "cookie" and uses one when dumps details about particular
socket.

The same will be required for udp diag module, so introduce a heler
in inet_diag module

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index 851feff0747f..503674738368 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h
@@ -144,6 +144,8 @@ struct inet_diag_handler {
 	__u16                   idiag_type;
 };
 
+int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req);
+
 extern int  inet_diag_register(const struct inet_diag_handler *handler);
 extern void inet_diag_unregister(const struct inet_diag_handler *handler);
 #endif /* __KERNEL__ */
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index bd3f661803a7..ba3ae1f73abf 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -246,6 +246,18 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 	return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
 }
 
+int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req)
+{
+	if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
+	     req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
+	    ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
+	     (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
+		return -ESTALE;
+	else
+		return 0;
+}
+EXPORT_SYMBOL_GPL(inet_diag_check_cookie);
+
 static int inet_diag_get_exact(struct sk_buff *in_skb,
 			       const struct nlmsghdr *nlh,
 			       struct inet_diag_req *req)
@@ -288,11 +300,8 @@ static int inet_diag_get_exact(struct sk_buff *in_skb,
 	if (sk == NULL)
 		goto unlock;
 
-	err = -ESTALE;
-	if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
-	     req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
-	    ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
-	     (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
+	err = inet_diag_check_cookie(sk, req);
+	if (err)
 		goto out;
 
 	err = -ENOMEM;